Will my chickens get depressed?

So yesterday I lost one of my 5 hens. She was killed my a predator. Now I feel like my flock has became less enthusiastic. I've had my girls for about a year and a half. Do you think the rest of my flock will feel loss or become depressed? They only knew each other for a little over a year, but my flock seems lonely being only 4 chickens.

They will feel there's something not quite right for sure, but it should only last a day or two. A hawk killed one of my chicks a week ago and the whole flock acted very strangely for quite a few days (caused probably by the attack itself, rather than the loss of the chick).

They get quiet so the predator doesn't find them as well, my poultry will always hide in the shed after an attack or attempted attack, they will resume their normal activities when they feel safe again.